610940809 has 2 divisors, whose sum is σ = 610940810. Its totient is φ = 610940808.

The previous prime is 610940807. The next prime is 610940821. The reversal of 610940809 is 908049016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 569299600 + 41641209 = 23860^2 + 6453^2 .

It is a cyclic number.

It is not a de Polignac number, because 610940809 - 2¹ = 610940807 is a prime.

Together with 610940807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (610940807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305470404 + 305470405.

It is an arithmetic number, because the mean of its divisors is an integer number (305470405).

Almost surely, 2^610940809 is an apocalyptic number.

It is an amenable number.

610940809 is a deficient number, since it is larger than the sum of its proper divisors (1).

610940809 is an equidigital number, since it uses as much as digits as its factorization.

610940809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 610940809 is about 24717.2168538450. The cubic root of 610940809 is about 848.5283920788.

The spelling of 610940809 in words is "six hundred ten million, nine hundred forty thousand, eight hundred nine".